diff --git a/tools/unix/check_cert.sh b/tools/unix/check_cert.sh
new file mode 100755
index 0000000000..2446526640
--- /dev/null
+++ b/tools/unix/check_cert.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+MONTHS_BEFORE_EXPIRATION_TO_BREAK="3"
+PRIVATE_H=$1
+if [[ "$PRIVATE_H" == "" ]]; then\
+	PRIVATE_H=$(dirname $0)/../../private.h
+fi
+
+while read line; do
+	eval $line
+done < <(
+	sed -e ':a' -e 'N' -e '$!ba' -e 's/\\\n//g' $PRIVATE_H |\
+	grep "^#define USER_BINDING_PKCS12" |\
+	sed -e 's/#define //' -e 's/ /=/' -e 's/$/;/'
+)
+if [[ "$USER_BINDING_PKCS12" == "" ]]; then
+	echo "No certificate found in private.h, skipping check"
+	exit 0
+fi
+
+read mon day time year tz < <(
+	echo $USER_BINDING_PKCS12 |\
+	base64 --decode |\
+	openssl pkcs12 -passin pass:$USER_BINDING_PKCS12_PASSWORD -clcerts -nodes |\
+	openssl x509 -noout -enddate |\
+	cut -d '=' -f 2-
+)
+
+if [[ $(uname) == "Darwin" ]]; then
+	threshold_timestamp=`LANG=C LC_ALL=C date -j -v "+${MONTHS_BEFORE_EXPIRATION_TO_BREAK}m" +%s`
+	cert_end_timestamp=`LANG=C LC_ALL=C date -j -f "%Y %b %d %H:%M:%S %Z" "$year $mon $day $time $tz" +%s`
+else
+	threshold_timestamp=`date --date "+$MONTHS_BEFORE_EXPIRATION_TO_BREAK months" +%s`
+	cert_end_timestamp=`date --date "$mon $day $year $time $tz" +%s`
+fi
+if [[ "$threshold_timestamp" -gt "$cert_end_timestamp" ]]; then
+	echo "Our client certificate end date of $mon $day $time $year $tz is within $MONTHS_BEFORE_EXPIRATION_TO_BREAK months from now."
+	echo "Update this certificate immediately!"
+	echo "Aborting build"
+	exit 1
+else
+	echo "Our client certificate end date of $mon $day $time $year $tz is later than $MONTHS_BEFORE_EXPIRATION_TO_BREAK months from now."
+	echo "Certificate check passed, continuing the build"
+	exit 0
+fi